Write her a letter detailing the best you can why you are suffering. Be as honest as possible. I know this is hard but once you admit it to someone else it will be less of a burden on you, even if only slightly. People usually tend to take written material more seriously than spoken material, in my experiences. But also, be prepared in case she doesn't take that seriously also. If that happens, take action yourself. If you don't drive or can't afford it on your own, there are free resources available. Recovery groups. See a school counselor or college counselor- free. Read self help books. Until you are able to go on your own.